#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>
int main()
{
    int n, h, m;
    while (scanf("%d%d%d", &n, &h, &m) != EOF)
    {
        if (m <= n * h)
        {
            n = n - m / h;
            if (m % h != 0)
            {
                n = n - 1;
            }
        }
    }
    printf("%d", n);
    return 0;
}
